上机实践3继承与接口

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1、实验三继承与接口一.实验目的巩固如下概念：子类的继承性、子类对象的创建过程、成员变量的继承与隐藏、方法的继承与重写；学握上转型对象的使用；学握接口冋调技术。二.实验要求实验前，应事先熟悉相关知识点，拟出相应的实验操作步骤，明确实验冃的和要求；实验过程中，服从实验指导教师安排，遵守实验室的各项规章制度，爱护实验仪器设备；实验操作完成后，认真书写实验报告，总结实验经验，分析实验过程中出现的问题。三.实验内容1、继承编写一个Java应用程序，除主类外，该程序屮还有4个类：People、ChinaPeople>Amer

2、icanPeople和BeijingPeople类。要求如下:People类有访问权限是protected的double型成员变量:height和weight,以及publicvoidspeakHelloO>publicvoidaverageHeight()>publicvoidaverageWeight()方法；ChinaPeople类是People的子类，新增了publicvoidchinaGongfuO方法。要求ChinaPeople重写父类的publicvoidspeakHelloO、publicvoi

3、daverageHeight()、publicvoidaverageWeight()方法；AmericanPeople类是People的子类，新增publicvoidamericanBoxing()方法。要求AmericanPeople重写父类的publicvoidspeakHelloO、publicvoidaverageHeight()、publicvoidavcragcW'cight()方法；BeijingPeople类是ChinaPeople的子类，新增publicvoidbeijingOpera()方法

4、。要求BeijingPeople重写父类的publicvoidspeakHelloOpublicvoidaveragelleight()、publicvoidaverageWeight()方法；请按模板要求，将【代码】替换为Java程序代码。Example.javaclassPeople{protecteddoubleweight,height;publicvoidspeakHello()System,out.prin11n(/zyayavawaz/);publicvoidaverageHeight()hei

5、ght=173;System,out.printin(''averageheight:z/+height);}publicvoidaverageWeight(){weight=70;System,out.println("averageweight:，?+weight);}}classChinaPeopleextendsPeople{【代码1】//重写publicvoidspeakllello()方法【代码2】//重写publicvoidaverageHeight()方法【代码3】//重写publicvoida

6、verageWeight()方法publicvoidchinaGongfu(){【代码4】//输出中国武术的信息}}classAmericanPeopleextendsPeople{【代码5】//重写publicvoidspeakHelloO方法【代码6】//重写publicvoidaverageHeight()方法【代码7】//重写publicvoidaverageWeight()方法publicvoidamericanBoxingO{【代码8】//输出拳击的信息}}classBeijingPeopleext

7、endsChinaPeople{【代码9】//重写publicvoidspeakllello()方法【代码10】〃重写publicvoidaverageHeight()方法【代码11】〃重写publicvoidaverageWeight()方法publicvoidbeijingOpera(){【代码12】//输出京剧的信息}publicclassExamplepublicstaticvoidmain(Stringargs[])ChinaPeoplechinaPeople二newChinaPeople();Ame

8、ricanPeopleamericanPeople二newAmericanPeople();BeijingPeoplebeijingPeople=newBeijingPeople();chinaPeople.speakHelloO;americanPcoplc.speakHello();beijingPeople・speakHello();chinaPeople.averageHeig